Mark Mittelberg is a bestselling author, international speaker, and the Executive Director of the Lee Strobel Center for Evangelism and Applied Apologetics at Colorado Christian University, which offers accredited BA and MA degrees, as well as highly affordable certificate courses for those not seeking college credit — all online (StrobelCenter.com).

Mark recently released his all-new book and training course, Contagious Faith: Discover Your Natural Style for Sharing Jesus with Others. Before that he was the primary author of the Becoming a Contagious Christian training course (with Lee Strobel). This course was translated into more than twenty languages and helped two million people around the world learn to share Christ in natural ways. He also wrote the leadership-oriented book, Becoming a Contagious Church, which presents an innovative blueprint for church-based evangelism, as well as several books on apologetics, including Confident Faith and The Questions Christians Hope No One Will Ask (With Answers).

Mark was the first evangelism director at Willow Creek Community Church in Chicago, as well as Executive Vice President of the Willow Creek Association. He teaches for Summit Ministries in Manitou Springs, Colorado, and is the main U.S. evangelism trainer for the Luis Palau Association. He writes and speaks from Denver, where he and his wife Heidi live (they have two grown children, Emma Jean and Matthew, both serving in ministry roles).